Two friends, William and Brayden, had just bought their first cars. The equation y=41.5xy=41.5x represents the number of miles, yy, that Brayden can drive his car for every xx gallons of gas. William uses 11 gallons of gas to drive 215.6 miles in his car. How much farther can Brayden's car travel on one gallon of gas than William's car?

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z